Improvement in collars for circular saws



l dbd-teh Seite anni cfm.

JAMES B. HEALD, OF MILFOBD, NEW HAMPSHIRE.

Letters Patent No. 109,898, dated December 6, 1870.

IMPROVEMEN'I. IN COLLARS FOR CIRCULAR SAWS.

The Schedule referred to in these Letters Patent: and mfrk'iligparl:v of the same.

exact description ot' the same, reference being had to the accompanying drawing which forms apart of this spcrilication, in whichl Figure 1 represent-s a side` view of my imj'n'oved saw-collar;

Figure 2 represents a central lollgitudinal section of the arbor and collar; and

Figure 3 represents a perspectivcwiew of the in terior part of the outside half of the collar.

To enable those skilled in the -art to which my invention belongs to make and use the same, I will proceed to describe it more in detail. v

The nature of my invention consists in an improved collar for circular saws, provided witlra peculiarly constructed centering device, to facilitate the adjustment of'diereiit sawsupon the arbor, as hereinafter explained. v v

In the drawing, the parts marked A represent the arbor;

B B indicate the halves otl the collar;

G'indicates the holding-nut; and

D, the saw.

The arbor A is yturned oft` at the end to form a shoulder, d, against which the back of the inside half` Il', ofthe collar rests, as indicated in the drawing.

rlhe outer half', B, of the collar is formed hollow,

and in its interior is .arranged a series of steel points,

E, supported in a movable insidecollar or ring, F,

from which their ends project, said ends being bev-` eled off, as indicated in ljgs. 2 and 3.

A thin steel washer, I, is riveted to the back side ot' thc-ring ll, to support the points E in position, and still allow them to spring slightly iuwardwith any pressure upon their outer beveled ends, so that they will press closely down upon the arbor A when in use.

A coiled spring, Gr, is arranged within the opening, atthe rear ofthe ring F, which presses said ring out even with the ,face ofthe collar B,.while pins b are set at the sides of the opening, op which the ring F can slide back andforth, and by means of which it is retained wit-hin the opening, and also prevented from turning around.

The saw D is arranged upon the arbor A, between the two parts of thercollar B B.

The bevel points E enter the eye ot' the saw, and should the eye be ot greater diameter than the arbor, the saw will be properly centered and supported by A the beveled points E.' y As the nut C is screwed on, the two parts of thecollar B and B `clamp and hold the saw.

The points E and ring F recede into the opening, so that the former project onlyju'st far enough to fretainthesaw at its proper center.

By the use of my improvement, .saws with different sizes of'eye can be quickly attached to the arbor,

since the yielding points E always cause tliem to tit in a central position; and again, incase of the arbor', becoming heated, the saw will not be sprung or warped, as'it would it' the eye of the saw ttcd'closely oh the l arbor, or was filled with a solid bushing or continuous centering ring.

Having described my improvements in collars for circular saws, Y

fhat I elaimtherein as new and of my'invcntion, and desire to secure by Letters Patent,'iS-

The combination `with the collar B, ring F, and points E, of the steel washerI, and spring G, substantially as and for the purposes set forth.

- Y JAMES B. HEALD.

Vitncsses:

G. WADLEIGH, (l. P. Rossrren. 

